-----BEGIN PGP SIGNED MESSAGE----- NetBSD Security Advisory 2002-002 ================================= Topic: gzip buffer overrun with long filename Version: NetBSD-current: prior to January 16, 2002 NetBSD-1.5.*: affected up to and including 1.5.2 NetBSD-1.4.*: affected up to and including 1.4.3 Severity: local buffer overrun (possible remote root privilege compromise if a system runs certain alternative ftp daemons) Fixed: NetBSD-current: January 16, 2002 NetBSD-1.5 branch: January 16, 2002 NetBSD-1.4 branch: January 16, 2002 Abstract ======== /usr/bin/gzip, a file compression program, does not properly check supplied filenames against its buffer size. It could lead to execution of arbitrary code under the privilege with which gzip is running. There are ftp daemon programs that invoke gzip on demand (like wu-ftpd). If your systems run these daemons, depending on the configuration it could lead to a remote root compromise. Technical Details ================= http://www.securityfocus.com/bid/3712 Solutions and Workarounds ========================= The following instructions describe how to upgrade your /usr/bin/gzip binaries by updating your source tree and rebuilding and installing a new version of /usr/bin/gzip. * NetBSD-current: Systems running NetBSD-current dated from before 2002-01-16 should be upgraded to NetBSD-current dated 2001-01-17 or later. The following directories need to be updated from the netbsd-current CVS branch (aka HEAD): gnu/usr.bin/gzip To update from CVS, re-build, and re-install gzip: # cd src # cvs update -d -P gnu/usr.bin/gzip # cd gnu/usr.bin/gzip # make cleandir dependall # make install * NetBSD 1.5, 1.5.1, 1.5.2: Systems running NetBSD 1.5, 1.5.1 or 1.5.2 sources dated from before 2002-01-16 should be upgraded from NetBSD 1.5.* sources dated 2002-01-17 or later. NetBSD 1.5.3 will not be vulnerable. The following directories need to be updated from the netbsd-1-5 CVS branch: gnu/usr.bin/gzip To update from CVS, re-build, and re-install gzip: # cd src # cvs update -d -P gnu/usr.bin/gzip # cd gnu/usr.bin/gzip # make cleandir dependall # make install Alternatively, apply the following patch (with potential offset differences): ftp://ftp.netbsd.org/pub/NetBSD/security/patches/SA2002-002-gzip.patch To patch, re-build and re-install gzip(1): # cd src/gnu/usr.bin/gzip # patch < /path/to/SA2002-002-gzip.patch # make cleandir dependall # make install * NetBSD 1.4, 1.4.1, 1.4.2, 1.4.3: Systems running NetBSD 1.4, 1.4.1, 1.4.2 or 1.4.3 sources dated from before 2002-01-16 should be upgraded from NetBSD 1.4.* sources dated 2002-01-17 or later. The following directories need to be updated from the netbsd-1-4 CVS branch: gnu/usr.bin/gzip To update from CVS, re-build, and re-install gzip: # cd src # cvs update -d -P gnu/usr.bin/gzip # cd gnu/usr.bin/gzip # make cleandir dependall # make install Alternatively, apply the following patch (with potential offset differences): ftp://ftp.netbsd.org/pub/NetBSD/security/patches/SA2002-002-gzip.patch To patch, re-build and re-install gzip(1): # cd src/gnu/usr.bin/gzip # patch < /path/to/SA2002-002-gzip.patch # make cleandir dependall # make install Thanks To ========= Jun-ichiro itojun Hagino for patches, and preparing advisory text. Revision History ================ 2002-03-12 Initial release More Information ================ An up-to-date PGP signed copy of this release will be maintained at ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2002-002.txt.asc Information about NetBSD and NetBSD security can be found at http://www.NetBSD.ORG/ and http://www.NetBSD.ORG/Security/. Copyright 2002, The NetBSD Foundation, Inc. All Rights Reserved. $NetBSD: NetBSD-SA2002-002.txt,v 1.6 2002/03/12 05:45:35 groo Exp $ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (NetBSD) Comment: For info see http://www.gnupg.org iQCVAwUBPI4yDj5Ru2/4N2IFAQFJEQP/V2bfCwyBjhwcLifk7rxyBdU4ft2mX3K7 g7mdoD/Ljwe8xXAGb1HuxzdtKTIZGVbMBYqjDA6OwTjNn9V5Fzz8WZ/tGMwT+CTH u5m09oEp2UOd7aSfGd+aIGZyjovFZEU7q+6iDln0wRk6vhQTC9y193wLAEK8ONDG pkSXVUCmAPA= =7p76 -----END PGP SIGNATURE-----
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